Diamond drill bit



March 20, 1945. J. .0. MacFARLANE DIAMOND DRILL BIT- 2 Sheets-Sheet 1 Filed Sept. 24, 1943 n YCET'ZY zgggrqnc I Hm" J. D; M FARLANE' 2,371,698

DIAMOND DRILL BIT March 20, 1945.

Filed Sept. 24, 1943 2 Sheets-Sheet 2 I-Tg- B D Q I I \L/s Inyeri'hfi rah n "110E? 4H2.

Patented Mar. 20, 1945 UNITED srnr ES PATENT or ree t 2,371,698 I DIAMO D DRILLBiT v 'John Duncan MacFarlane; Stoney Creek, on-

tario, Canada, assignor of. one-half to Leo Donahue,Sarnia,-0ntario, Canada:

Application Sentembcr 24, 194s,' s ria1"No. 503,733

. 6 Claims. (01. 255-64) This invention recites to drill bitsemployed in the mining profession for drilling through the geological strata of thesubsurface of the earth and more particularly to a corelessblast hole bit.

The bit is secured to the end of the .drill rod and the water carried from the core of the drill rod through the core of the bit to the diamond studded face of the bit. f

Thisinvention has for its principal object the provision of an annular groove in the bit face or more properly, the face of thesleeve in which is set the diamonds, to the end that the diamonds are conserved and faster drilling is obtained.

to which it is attached. I prefer to call the band The invention also contemplates the provision of an improved water clearance from the core of the drill rod to the face of the' bit to the end that better drilling is obtained through the subsurface due to the rotation of the water spray against the area progressively entered by thedrill. 7

Another advantage found to be inherent in the invention is. the lack of vibration when the bit is in use. The reason is not obvious, nevertheless it has been observed that there is much less vibration than is customary in drill bits heretofore obse ved.

Other objects of a more general nature are to provide a simple, comparatively inexpensive, durable and efiicient device of the character set forth.

With the above noted and other objects in view which may appear as the description proceeds the invention resides in the novel construction, combination and arrangement of cooperating parts as hereinafter more specifically set forth,

other embodiment of our invention.

Fig. 7 is an elevational view taken at right angles to and of the stock of Figure 6.

Fig. 8 is a fragmentary sectional view of a still further embodiment of the core, and

Fig. 9 is a fragmentary sectional view of the core of Figure 8, and the complementary sleeve.

Referring more in detail tothe drawings in which similar reference characters designatecorresponding parts throughout the several views it will be seen that the invention consists of a stock indicated by the numeral I0 and a sleeve indicated bythenumeral ll. 1

d with a homogenetic The. stock i 0 is provid band l2, at. a predetermined position intermediate the ends of the stock which has a diameter greater than the diameter of tlieremainder of the stock and equalto the. diameter of they sleeve and the diameter of the drill rod..(not shown) [2 a shoulder, as which it will be hereinafter referred to. l

The male screw thread I 3, I prefer a square screw. thread, is connected to the end of the drill rodsection in the usual manner so that the periphery of the drill rod abuts shoulder l2. On the opposite side of the shoulder and adjacent thereto is another screw thread I4,.preferably a square screw thread which receives the sleeve. .1 I

The sleeve l l, ther fore, encloses the forepart of the stock 10;and is provided with an inwardly. extendingannular flange I5, which'substantially' reduces the opening I6, which communicates with the aforementioned stock [0. The face of the annular flange I5 is provided with an annular recess or groove in which the diamond chips H are set in the usual manner. V

Referring again to the stock It], it will be seen that the same is provided with a central conduit l8, which communicateswith the central conduit of the drill rod. The conduit is directed angularly upward at 19, toward the surface of the stock It, where it communicates with an inclined trough 2!), leading to the opening iii, of the sleeve abuts the inside face of the flange I 5 (Fig. 1) i when the sleeve is tightened on the stock. The

In the drawings Figures 1 to 5, inclusive, disclose a bit substantially as disclosed above in which the semi-circular periphery 2| of the stock water coming through the conduit l8 races out trough 2|] past the annular opening 16 to the subsoil.

Figures 8 and 9 disclose a bit similar to the bit of Figures 1 to 5, inclusive, with the exception of a shoulder 22, at the semicircular periphery of the stock. The shoulder 22 is recessed substantially equal to thesize of the flange 15, so that the peripheral edge 2| isin the same plane as the face of the sleeve when the said sleeve is tightened on the stock as shown most clearly in Figure 9.

Figures Sand 7 disclose my preferred embodiment of the invention wherein the forepart of the bit is stepped down as indicated at Illa, and the peripheral edge 2| is in the same plane as the face of the sleeve II. It will be noticed that the sleeve II is thickened at 23, to strengthen the same and to assist the direction of the water down the trough rather than against the inner face of the flange; i

It is believed that the constructiom andad vantages of the structure shown may be apparent from the foregoing paragraphs taken in conjunca: tion with the accompanying drawings, without further detailed description.

While the preferred embodimentof. the.-inven-,- tion has been disclosed it is understood: that "minor changes in the details of constructionycomh j bination and arrangement of. cooperating parts. --may be resorted towithin the scope ofwliat' is claimed without departing from the spiritiofithe invention.

' 1". A bitfor diamonddr-illing;astock; ahomogenetic" shoulder intermediate the ends of the stock; means on'oneside. ofithe shoulder for attachment .to a drill rod, ,a sleeve; attaclied'totthe' stock on" the other side" oftheshoulder; a conduit centrally-through the stock; said conduit communicating' with an inclined trough cut in: the stock; anannulargroove in" the faceof the sleeve anddiamonds set inthe groove; arranged so that water escaping from the trough" passes: the face ofth'e sleeve;

2: A bit'for diamond drilling; astock; ahornogenetic shoulder intermediate the ends of the stockga screw thread on one" side" of the shoulder 3. A bit for diamond drilling, a stock, a homogenetic shoulder, intermediate the ends of the stock, a screw thread on one side of the shoulder for attachment to a drill rod, a screw thread on the other side of the shoulder to receive a sleeve, an inclined trough cut in the sleeve receiving end of the stock and a conduit through the stock communicating with the top of the trough, a semicircularrsh'oulden in theeperipheraiiedge of the stock; theevwhoieearrangedzso thatithe face of the stock is in the same plane as the face of the sleeve 'w-hen the two are secured, an annular groove in theface of the flange and diamonds set in the groove;

4: Atbit-,consisting; of a stock, a homogenetic shoulder; intermediate the ends of the stock, a

S01eW th1B3Jd On" one side of the shoulder for attachmentgto a drillrod, a screw thread on the other side of the shoulder to receive a sleeve, an inwardlyextending annular flange at the free end of, the sleeve. diamonds set in an annular for attachment to' a drill iIOd', a screw threa'd'on theoth'er side of the shouldertoreceivea; sleeve, an inclined trough-cut in thesleeve'receiving end of; the stock and'a conduit through'tliestockcommunicatingwith the topof' the trough; the wholearranged so that the peripheraledgeof'the stock abuts the inner surface of a flange and the'sleeve when the two are secured, anannular grooveiin the face of the flange. andidiamonds setlin the groove;

groove in the flange face; the said stock being stepped" down from the shoulder to the: end, the whole arranged so that the peripheral edge) of the endiofthestock is'in the same'planeasflthe face ofthe bit; a conduit from the drillrodend of: the bit to, the source of an inclinedftrough cut inward'from the opposite end ofthe stock:

5. A diamond drill,. a bit having" a central conduit communicating with an" inclined" trough JOHNDUNGAN 

